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7f217794 AB |
1 | These properties are common to multiple MMC host controllers. Any host |
2 | that requires the respective functionality should implement them using | |
3 | these definitions. | |
4 | ||
ed3efc1c CB |
5 | Interpreted by the OF core: |
6 | - reg: Registers location and length. | |
7 | - interrupts: Interrupts used by the MMC controller. | |
8 | ||
7f217794 AB |
9 | Required properties: |
10 | - bus-width: Number of data lines, can be <1>, <4>, or <8> | |
11 | ||
abe1e05d CB |
12 | Card detection: |
13 | If no property below is supplied, standard SDHCI card detect is used. | |
14 | Only one of the properties in this section should be supplied: | |
15 | - broken-cd: There is no card detection available; polling must be used. | |
16 | - cd-gpios: Specify GPIOs for card detection, see gpio binding | |
17 | - non-removable: non-removable slot (like eMMC); assume always present. | |
18 | ||
7f217794 | 19 | Optional properties: |
ed3efc1c CB |
20 | - wp-gpios: Specify GPIOs for write protection, see gpio binding |
21 | - cd-inverted: when present, polarity on the cd gpio line is inverted | |
7f217794 | 22 | - wp-inverted: when present, polarity on the wp gpio line is inverted |
7f217794 AB |
23 | - max-frequency: maximum operating clock frequency |
24 | ||
e5d0e9c5 AK |
25 | Optional SDIO properties: |
26 | - keep-power-in-suspend: Preserves card power during a suspend/resume cycle | |
27 | - enable-sdio-wakeup: Enables wake up of host system on SDIO IRQ assertion | |
28 | ||
7f217794 AB |
29 | Example: |
30 | ||
31 | sdhci@ab000000 { | |
32 | compatible = "sdhci"; | |
33 | reg = <0xab000000 0x200>; | |
34 | interrupts = <23>; | |
35 | bus-width = <4>; | |
36 | cd-gpios = <&gpio 69 0>; | |
37 | cd-inverted; | |
38 | wp-gpios = <&gpio 70 0>; | |
39 | max-frequency = <50000000>; | |
e5d0e9c5 AK |
40 | keep-power-in-suspend; |
41 | enable-sdio-wakeup; | |
7f217794 | 42 | } |